Meiosis (Reduction Division)
Use & for "and." Use #'s; don't spell any out. Every answer ends in a period.
Terms in this set (42)
A process of reduction division in which the number of chromosomes per cell is cut in half through the separation of homologous chromosomes in a diploid cell.
Chromosomes that have a corresponding pair from the opposite sex parent.
A cell that contains both sets of homologous chromosomes.
A chromosome that is not a sex chromosome.
A cell that contains a single set of chromosomes.
Sex cells (sperm & egg.)
Process of Meiosis
Starts with 1 diploid cell & ends with 4 haploid cells.
Product of Meiosis
Two Distinct Divisions
Meiosis 1 & Meiosis 2.
Occurs before the cell enters meiosis. The cell grows, DNA is replicated & centrioles are replicated.
DNA condenses from chromatin into chromosomes. The centrioles move to the poles & create the spindle. The nuclear membrane disintegrates & disappears. The nucleolus disintegrates & disappears. Each chromosome pairs with its corresponding chromosome to form a tetrad.
A group of four chromosomes that have crossed over.
As homologous chromosomes pair up & form tetrads, they exchange portions of their chromatids. This results in an exchange of genes which produces new genetic combinations & genetic diversity.
The chromosomes line up double file in the middle of the cell. There are 2 chromosomes on each spindle fiber instead of only 1. Homologous pairs of chromosomes are located on each spindle fiber.
The centromeres of each chromosome does not disintegrate, so the sister chromatids do not separate. Entire chromosomes move to the poles- one chromosome in each pair goes to one side of the cell & the other chromosome in the pair goes to the other side.
The chromosomes do not unwind back into chromatin. The spindle breaks apart & disappears. The nuclear membrane & nucleolus reform. Cytokinesis occurs. The cell separates into 2 cells.
Between meiosis 1 & meiosis 2. DNA does not replicate.
The two cells produced by meiosis 1 enter a second meiotic division.
DNA is already in chromosome form from meiosis 1. Centrioles move to the poles & create the spindle. The nuclear membrane & nucleolus disappear.
The chromosomes line up single file.
The centromere of each chromosome disintegrates & the sister chromatids separate- one chromatid goes to one pole & the other moves to the other pole.
The chromosomes unwind back into chromatin. The spindle breaks apart & disappears. The nuclear membrane & nucleolus reforms. Cytokinesis occurs.
An uneven split in chromosomes (3:1) that can result in many different diseases.
A result of a chromosome imbalance.
What happens to DNA during Prophase I
DNA condenses from chromatin into chromosomes.
What happens to centrioles during Prophase I
The centrioles move to the poles & create the spindle.
What happens to the nuclear membrane & nucleolus during Prophase 1
How a tetrad is formed
Each chromosome pairs with its corresponding chromosome.
When synapsis occurs
During Prophase 1 when the chromosomes cross over & 'snap' together.
How chromosomes line up during Metaphase 1
The number of chromosomes on each spindle fiber during Metaphase 1
The type of pairs located on each spindle fiber
What happens to each centromere of chromosomes during Anaphase 1
They do not disintegrate & therefore, the sister chromatids do not separate.
How the chromosomes move to the poles during Anaphase 1
Entire chromosomes move to the poles- one chromosome in each pair goes to one side of the cell & the other chromosome in the pair goes to the other side.
What happens to chromosomes during Telophase 1
The chromosomes do not unwind back into chromatin.
What happens to DNA during Interphase 2
DNA does not replicate.
What happens to the nuclear membrane & nucleolus during Prophase 2
How chromosomes line up during Metaphase 2
What separates during Anaphase 2
The sister chromatids separate- one chromatid goes to one pole & the other moves to the other pole.
What happens to chromosomes during Telophase 2
The chromosomes unwind back into chromatin.
YOU MIGHT ALSO LIKE...
MCAT Biology | Kaplan Guide
Mitosis and Meiosis
Meiosis - Cell cycle
OTHER SETS BY THIS CREATOR
Wordly Wise Sem. 2
Mitosis vs. Meiosis
Cell Growth & the Cell Cycle
THIS SET IS OFTEN IN FOLDERS WITH...
Bio lecture 8
M Lab 8
Chapter 10 - photosynthesis (notes)